Several air to air combats were reported during small wars and border skirmishes between the different nations of Central Europe, the years before the WWII:
Hungary-Slovakia border skirmishes, 1939.
Air space violations.

The lists

All the lists present the following data:
Name and (when known) first name are presented with arbitrary choice for the spelling (russian, german, arab names...).
RANK of the pilot: see the rank page for the meaning of the abbreviations and the equivalence.
According to the pages, COUNTRY, NATION for the nationality or ethnic origin, AIR_SERVICE for the air arm, are provided.
The number of victories represents usually the total of kills (individual plus shared). The shared kills are indicated when known under the form [indiv+shared]. The official score is indicated when different from the total (American and British scores of ww2 for example).
Authors of the SOURCES column are given; report to the bibliography page to find the books, articles, web pages in alphabetical order. The OTHER_SOURCES column presents the divergent scores with sometimes the author of the source.
The DETAIL column shows occasionally the type of kill, balloons, V-1s, ground kills, unconfirmed kills...
The NOTE column exposes different commentaries and for lack of space, abbreviations are used: report to the abbreviation page for their meaning.